Question About Sesamstraat

I read at Muppet Wiki and at IMDb that for the first season of the Dutch co-production Sesamstraat, their street was shot on location in a half Dutch/half Belgian town since the show was originally a Dutch/Belgian co-production; then in the second season, a realistic-looking Dutch street was built inside a sound stage, before taking on the familiar abstract-look it had before the set was changed to look like the inside of a toybox last year.

However, I read quite a while ago at the official Sesamstraat - NPS site that in the beginning, there was no street/straat at all so they had to super-impose the characters in front of still shots of what served as the street via green-screen or blue-screen, or whatever before they built the abstract-looking set.

I'm not sure which to believe: on the one note, I'm sure everything at Muppet Wiki is as accurate as possible, from what I've seen as far as early Sesamstraat is concerned, it seems evident that everyone was super-imposed in front of a street via green or blue screen.

However, I read quite a while ago at the official Sesamstraat - NPS site that in the beginning, there was no street/straat at all so they had to super-impose the characters in front of still shots of what served as the street via green-screen or blue-screen, or whatever before they built the abstract-looking set.